gulpfile.js

var gulp = require('gulp');
var gutil = require('gulp-util');
var bower = require('bower');
var concat = require('gulp-concat');
var sass = require('gulp-sass');
var minifyCss = require('gulp-minify-css');
var rename = require('gulp-rename');
var sh = require('shelljs');
var inject = require('gulp-inject');
var angularFilesort = require('gulp-angular-filesort');

var paths = {
  sass: ['./scss/**/*.scss'],
  components: ['./www/js/{,**/}*.js', './www/css/**/*.css']
};

gulp.task('default', ['sass', 'index']);

gulp.task('sass', function (done) {
  gulp.src('./scss/ionic.app.scss')
    .pipe(sass())
    .on('error', sass.logError)
    .pipe(gulp.dest('./www/css/'))
    .pipe(minifyCss({
      keepSpecialComments: 0
    }))
    .pipe(rename({extname: '.min.css'}))
    .pipe(gulp.dest('./www/css/'))
    .on('end', done);
});

gulp.task('index', function () {
  return gulp.src('./www/index.html')
    .pipe(inject(
      gulp.src('./www/js/{,**/}*.js', {relative: true}) // gulp-angular-filesort depends on file contents, so don't use {read: false} here
        .pipe(angularFilesort()),
      {
        relative: true
      }
    ))
    .pipe(inject(gulp.src(['./www/css/**/*.min.css'], {read: false}), {relative: true}))
  .pipe(gulp.dest('./www'));
});

gulp.task('watch', function () {
  gulp.watch(paths.sass, ['sass']);
  gulp.watch(paths.components, ['index']);
});

gulp.task('install', ['git-check'], function () {
  return bower.commands.install()
    .on('log', function (data) {
      gutil.log('bower', gutil.colors.cyan(data.id), data.message);
    });
});

gulp.task('git-check', function (done) {
  if (!sh.which('git')) {
    console.log(
      '  ' + gutil.colors.red('Git is not installed.'),
      '\n  Git, the version control system, is required to download Ionic.',
      '\n  Download git here:', gutil.colors.cyan('http://git-scm.com/downloads') + '.',
      '\n  Once git is installed, run \'' + gutil.colors.cyan('gulp install') + '\' again.'
    );
    process.exit(1);
  }
  done();
});